hi David, the QED123 can be connected exactly as a regular LED the short leg goes to ground as shown in the diagram: http://wiring.org.co/learning/examples/led_blinks.htmlthe diagram shows how to connect a led to a digital pin, the led could also be connected to a PWM (analog output pin) like this: http://wiring.org.co/learning/examples/led_fade.htmlso you could control "intensity" for it.Let me know if this is fine for you.